Yeah! Taking a partial drop can be beneficial for you if you really aspire to crack the examination. Now in general most of the colleges takes the fees semester wise. As a result you have not to pay the whole 4 year fees. So if you take admission in any college and study side by side and if you get a chance in BITSAT then you can leave the college.

To know more about BITSAT preparation tips visit the link below:

https://engineering.careers360.com/articles/bitsat-preparation-tips

For TS EAMCET preparation tips visit the link below:

https://engineering.careers360.com/articles/how-crack-ts-eamcet

I hope this answer helps. All the very best for your future endeavors!